WINTER WHEAT IN THE GREAT PLAINS AREA. ile7/ 
and peas as green manure and by disked corn ground. The average 
yield of 15.4 bushels per acre from disked corn ground is higher 
than that following any other harvested crop, but is 5.2 bushels 
less than on summer tillage and 0.7 bushel less than on rye as green 
manure. The yields after rye as a green-manure crop have been 
consistently higher than the yields after peas. Ground plowed 
early in the fall yields nearly twice as much on the average as ground 
plowed late, but only about three-fifths as much as disked corn ground. 
The results from listing and subsoiling are not sufficient for com- 
parison with the results obtained from other methods. (Table IX.) 
Taste IX.— Yields and cost of production of winter wheat by different methods at the 
Scottsbluff Field Station, 1912 to 1916, inclusive. 
Yiel reek, 
Number ield per acre (bushels) 
Treatment and previous crop. O peg | —— = ee eS 
averaged.| 1912 | 1913 | 1914 | 1915 | 1916 | Average. 
Early fall plowed: Winter wheat........- 1 6.3 dod, 17.8 8.7 5.2 9.1 
Late fall plowed: Winter wheat.......... 1 0 0 12.8 11.7 2.5 5.4 
Mistedsawiniterwwheatcs. sos 866 se oe Sys a ile ip SO Th a oI a 3.8 3.8 
Subsoiled: Winter wheat................. sD ctl cee S| ee cpa 2253n| aaa 5.0 13.7 
Diskedsy Conmees se pend ey Fue toe, 5 Sih he 3 15.6 10.5 18. 2 20. 1 6.9 15.4 
Green manured: 
WAG iny Ghretnsercine acmisscisesS se cutscene: 1 14.0 9.0 26.7 23.8 7.0 16.1 
Wal bn peaseees ey oe eee ee UES 1 12.3 6.3 23839 | Ane 6.3 12.1 
Motalioniaveragesssss- sees asec eee ae 2 13.2 Ue 25.0 | @23.8 6.7 15.3 
Sumimerktilled eee seem pase es My fs otha 2 20.9 6.8 32.0 37.0 6.2 20.6 
PeVeragconell Wills eet Ae ees ee ee eli aes Cees 13.5 Mao 22.1 22.2 ‘ont 14.2 
SUMMARY OF YIELDS AND DIGEST OF CosT. 
Tillage treatment. Previous crop. 
Yields, values, etc. Early | Late Green | Sum- Winter 
(average per acre). fall fall | Listed Rolled Disked| maz- mer ‘| wheat Corn 
(3 | nured | tilled a 
plowed plowed ia (1 a 
pias ae plat). plat). plats). Ae Bie plats). plats). 
Yields of grain: | 
Oe. Bere gs LE. bushels. . 6.3 Osril Pa aa Rs 15.6 13.2 2OP9R | Ise2 15.6 
TKS) 1S) ee See ety cee do.. tot (ipa Soca eel asme eee 10.5 doll 6.8 | 63.9 10.5 
IOWA ie EEE Pad do... 17.8 12E Sie ae ee 22.3 18. 2 25.0 32.0 | ¢ 17.6 18.2 
1 AO) a as eee =e do.. 8.7 1 Ts SY (an eee ee, (rs ole 25.7 | @ 23.8 37.0 4.1 25.7 
UI eee eG a ae Meas Se do.. 5.2 2.5 3.8 5.0 6.9 6.7 6.2 8.0 6.9 
AVeragone senso UEO TA. 9.1 5.4 3.8 7 15.4 15.3 20. 6 7.4 |e 1554 
Crop value, cost, etc.: 
WGI R eee posaeee ear cas $6.37 | $3.78 | $2.66 | $9.59 | $10.78 | $10.71 | $14.42 |......._|..... ee 
CoStar ayes Se Cae oh 6. 32 5. 65 5.03 7.03 4, 25 13. 96 LOR GAS | eee oe ae |e ener 
Prontior lossi-- 452. - .05 | —1.87 | —2.37 2. 56 6.53 | —3. 25 SH hej be pikry sel ease eies = 
a One plat in 1915. b Two plats in 1912 and 1913. ec Three platsin 1914. 
Disked corn ground has averaged the largest profit—$6.53 per 
acre. The next highest profit has been secured from summer tillage. 
Excepting subsoiling, since only two years’ results are available for 
9656°—17—Bull. 595——3 
